The climate in South Africa

Climate zone: The northern part of South Africa is located in the equatorial tropics, the southern parts of the country belong geographically to the subtropics.

In 8 months the average temperatures are over 25 degrees. Pleasant water temperatures of up to 22 degrees even invite you to take a bath in the warm season. The warmest and rainiest part of the country is Northern Cape. The coldest is Western Cape.

Temperature records of the last 73 years

The hottest temperature measured from 1949 to January 2022 was reported by the Upington weather station. In January 2016 the record temperature of 45.3 °C was reported here. The hottest summer from July to September, based on all 48 weather stations in South Africa below 1700 metres altitude, was recorded in 2019 with an average temperature of 14.4 °C. This average temperature will normally be measured every 4 to 6 hours, thus also including the nights. Normally, this value is 13.1 degrees Celsius. The average maximum daily temperature at that time was 21.5 °C.

The coldest day in these 73 years was reported by the weather station Bloemfontein. Here the temperature dropped to -12.2 °C in July 2000. Bloemfontein lies at an altitude of 1353 meters above sea level. The coldest winter (January to March) was in 1951 with an average temperature of 18.8 °C. In South Africa, it is usual to have about 1.9 degrees more at 20.7 °C for this three-month period.

The most precipitation fell in June 1959. With 20.0 mm per day, the Gough Island weather station recorded the highest monthly average of the last 73 years. Incidentally, the region with the most rainfall for the whole year is around Gough Island. The driest region is near Alexander Bay.

Long-term development of temperatures from 1976 - 2021

In contrast to single record values, a long-term development cannot simply be brought about by all weather stations in the country. Both the number and the locations are constantly changing. A simply calculated average value would give a falsified result. If several measuring stations in particularly cold mountain or coastal regions are added in one year, the average would already decrease as a result of this alone. If a station fails during the summer or winter months, it does not provide any values and falsifies the average again. The subsequent long-term development was therefore reduced to only 3 measuring points in order to have actually comparable data over as long a period as possible.

In the years 1976 to 2021 there were only these 3 weather stations in the whole country, which reported continuous temperature values (Cape Townort, Upington, Polokwane). From these weather reports we have created a long-term development that shows the monthly average temperatures. The hottest month in this entire period was January 2016 with 25.0 °C. July 1996 was the coldest month with an average temperature of 10.5 °C.

The average annual temperature was about 18.0 °C in the years after 1976 and about 19.3 °C in the last years before 2021. So in less than 46 years it has increased by about 1.3 °C. This trend only applies to the selected 3 weather stations in South Africa. A considerably more comprehensive evaluation of the global warming has been provided separately.

Data basis and methodology

The data of the individual measuring stations are based on the archives of the German Weather Service, individual values averaged and supplemented by own elements. In order to determine a representative national average, average values were first calculated for each part of the country, which were then summarized at the national level. Thus, if a disproportionate number of weather stations are located in a small area, their number does not affect the national average.